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For trouble-free sampling in saturated sands and plastic clays ... use the DT325 Dual Tube Sampling System.
 Geoprobe Systems® has invested countless hours of engineering and field testing into creating the DT325 dual tube system. The result is a system that allows practical and efficient dual tube sampling using Geoprobe® 3.25 in. probe rod.
The DT325’s unique combination of cutting shoe, sheath, and sample retainer allows efficient recovery of samples in formations ranging from plastic clays to saturated sands. The DT325 is designed to quickly recover samples well below the water table. Problems with liner failure or lodging are virtually eliminated with this system.
 Liners for the DT325 system are clear PVC with an integral core catcher fused to one end. This configuration maximizes sample recovery while minimizing entrance losses. It’s also proven to be very robust in use. The DT325 Liner Cutter, designed specifically for DT325 liners, permits safe, simple, and quick cutting of the liners for sample logging. The DT325 Soil Sampling System is robust and durable under the Geoprobe® GH62 Hammer. A Liner Retainer, with threads identical to the Sheath Drive Head, is stronger and prevents the retainer from fusing to the Sample Sheath. The thread pattern on the Liner Retainer also made it possible to put the same thread on both ends of the Sample Sheath which allows for more even thread wear when the sheath is turned end-for-end during use. The standard DT325 Cutting Shoe used with the Liner Retainer greatly improves sampling in plastic clays and saturated sands. The Expendable Cutting Shoe with O-ring and Holder are designed for a tight fit to eliminate the possibility of losing the cutting shoe during sampling. |
Reduce the headaches caused by stuck liners…
Problems with stuck liners in the DT325 system has been significantly reduced due to a more efficient liner retainer design, and a specially designed cutting shoe that has proven to help reduce the overfilling of a soil liner when sampling. Plastic clays are always a challenge to sample. In extreme conditions, it is recommended to increase the length of the sampler being used. For example, if plastic clays are encountered with a 48-in. sampler, then switch to a 60-in. sampler. Using a 60-in. sampler when collecting 48-in. samples will give the user an additional 12-in. buffer for the overall sample volume. This has been proven to significantly reduce problems when sampling in plastic clays.
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DT325 Sample Sheath
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The simple design of the DT325 Sample Sheath, which is available in 3 lengths, features the same internal thread pattern on both ends. This allows the user to maximize the thread life by rotating which end of the sample sheath is towards the top of the tool. There is no window sheath option for this system.
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 DT325 Dual Tube Sampler Advantages:
- Core catcher for sampling loose soils
- Solid drive point for driving to discrete depths before sampling
- Expendable cutting shoe for setting monitoring wells
- 4- and 5-foot sampling capacity
- Integrated with the use of Geoprobe® Light-Weight Center Rods or Geoprobe® 1.25-in. probe rods
- Durability needed to withstand the Geoprobe's® GH60 hammer
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| The design of the Expendable Cutting Shoe requires the use of an O-ring which temporarily locks the Expendable Cutting Shoe in the Expendable Cutting Shoe Holder. This locking O-ring system helps eliminate problems when sampling in saturated sands. This also prevents the Expendable Cutting Shoe from being unintentionally released from the Expendable Cutting Shoe holder. |
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